JPH0621820U - Tap tool - Google Patents

Abstract

(57) [Abstract] [Purpose] When the tap body is reversely rotated by a reversible rotation shaft, it tends to fall out due to the rotational resistance of the screw that has just been tapped. An object of the present invention is to provide a tap tool capable of completely preventing the metal holder and the protective member from falling off. [Structure] A tap body 1 in which a thread 4 for thread cutting is formed prior to a shank 2 and a square portion 5 is provided at a rear portion of the shank 2, and a part of the shank 2 and the square portion 5 of the tap body 1 are provided as shafts. In a tap tool consisting of a metal holder 6 which can be freely attached and detached in the direction, and which is fitted by restraining the free rotation in the rotation direction, a rear part of the protection member 9 is fitted and locked in the metal holder 6. The inner surface of the tip is provided with female threads 10 having a number of pitches to be screwed into the threads 4a having a number of pitches of the base portion of the threads 4 of the tap body 1. A tap tool that is screwed together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tap holder, in which a thread for thread cutting is formed before a shank and a square portion is provided at a rear portion of the shank, and a shank portion and a square portion of the tap body are axially arranged. Is a metal holder that can be freely attached and detached, and is fitted with free rotation in the direction of rotation.When the tap tool is reversed after turning the screw, when the tap body is rotated, It has a structure that prevents it from falling out.

[0002]

[Prior art]

 As shown in FIG. 5, a tap body a is formed by forming a thread c for thread cutting before the shank b, and a square portion e is provided at the rear portion of the shank b, and a part of the shank b and the square portion e of the tap body a. In a tap tool consisting of a metal holder f which can be freely attached and detached in the axial direction and which is fitted by restraining the free rotation in the rotational direction, a protective member is provided from the outer periphery of the metal holder f to the vicinity of the screw c of the shank b. It is well known that g is elastically and closely fitted. The above structure prevents the tap main body a, which is long in the axial direction, from being deformed when the reversible rotation shaft is rotated in the positive direction. However, this tool must be reversely rotated by the reversible rotation shaft after tapping, and the tap body a must be taken out from the screw that has just been threaded. There is a tendency for the rotation to be delayed, and after the screw is removed from the screw, the tap body a may fall out of the metal holder f and the protective member g due to the above tendency remaining. Therefore, be careful of the reverse rotation. Need to pay.

[0003]

[Problems to be solved by the device]

 The present invention allows the tap body to be screwed into the metal holder before being fitted into the metal holder, and then the tap body can be simultaneously fitted to the inner surface of the metal holder and the outer member of the metal holder. It is an object of the invention to solve the problem of providing a structure in which the tap tool does not fall off from the protective member and the metal holder without paying attention to the tap body.

[0004]

[Means for Solving the Problems]

 The present invention meets the above-mentioned object, and includes a tap body 1 having a screw 4 for thread cutting formed before a shank 2 and a square portion 5 provided at a rear portion of the shank 2, and a shank 2 of the tap body 1. In a tap tool consisting of a metal holder 6 in which a part and a square part 5 can be freely attached and detached in the axial direction and free rotation is restricted in the rotation direction, a rear part is fitted and locked in the metal holder 6. On the inner surface of the distal end of the protective member 9 thus formed, female screws 10 of several pitches which are screwed into the screws 4a of several pitches of the bases of the screws 4 of the tap body 1 are provided. It is characterized by the structure of a tap tool in which the protective portion 9 and the tap body 1 are fitted inside and outside the metal holder after being screwed into the female screw 10 of the protective member 9.

[0005]

[Action]

 In the tap tool of the present invention, the screw 4a of several pitches of the thread forming base of the tap body 1 is screwed into the female screw 10 of several pitches provided on the inner periphery of the tip of the protection member 9, so that when the screw is rotated in the reverse direction. Even if the tap body 1 is not paid attention to, the body 1 does not fall off the protective member 9 and the metal holder 6. That is, when the tap main body 1 is inclined to delay the reverse rotation of the reversible rotation shaft due to the rotation resistance of the screw when the screw is just tapped, the screw 4a of several pitches and the internal screw 10 are screwed together. The tap body 1 has to rotate several times to release the screw, but there is no such inertia force, and at the time of the next screwing, the reversible rotation shaft is rotated forward and the delay of the rotation is absorbed. The tap body 1 will not fall off as it has been due to repeated cancellation.

[0006]

【Example】

 The attached drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional side view of the first embodiment, FIG. 2 is an enlarged view of a part thereof, FIG. 3 is a perspective view of the same protective member, and FIG. It is a vertical side view of an example.

In the first embodiment shown in FIGS. 1 to 3, reference numeral 1 denotes a tap body having a diameter larger than that of the shank 2 and formed with axial grooves 3 at equal angular intervals over a part of the shank 2. Then, a screw 4 for thread cutting is provided between the concave grooves 3, and a square portion 5 is formed at the rear portion of the shank 2. Reference numeral 6 denotes a metal holder, which is a shank insertion hole 7 and a square hole 8 in which a rear part of the shank 2 of the tap body 1 and the square portion 5 can be freely attached and detached in the axial direction and restrained in free rotation in the rotation direction. And. The outer periphery of the square hole 8 is formed in a hexagonal shape so that it can be easily gripped by the chuck of the reversible rotation shaft, but the structure is adapted to it depending on the mode of the reversible rotation shaft.

9 is made of a slightly hard synthetic resin, rubber or the like so as to be elastically adhered to the outer periphery of the metal holder 6 and to be fitted to a part of the shank of the tap body 1 which does not enter the metal holder 6. The formed protective member is provided with an internal thread 10 of several pitches which is screwed onto the screw 4a of 2-4 pitches at the base of the screw 4 described above on the inner circumference of the tip. The female screw 10 may be provided with a helisert 11 for reinforcing a hard synthetic resin or the like.

To assemble the tap body 1, the metal holder 6, and the protection member 9, the above-mentioned screw 4 a of the tap body 1 is screwed into the female screw 10 of the protection member 9 to determine the relative position, and then the shank 2 The square portion 5 is fitted in the shank insertion hole 7 and the square hole 8 of the metal holder 6, and at the same time, the protective member 9 is fitted on the outer periphery of the metal holder 6 by causing elastic friction.

A second embodiment of FIG. 4 shows an embodiment in which a tap body having a shank 2 and a screw 4 having the same outer diameter of 6 mm or less is targeted. This tap tool is functionally and structurally the same as that of the first embodiment. In addition to this, there is a tap body 1 in which the outer diameter of the screw 4 is smaller than the outer diameter of the shank 2, but in this case, the assembly process is different, but the structure is the same.

[0011]

[Effect of device]

 According to the present invention, a tap body 1 is formed by forming a thread 4 for thread cutting prior to a shank 2, and a square portion 5 is provided at a rear portion of the shank 2, and a part of the shank 2 and the square portion 5 of the tap body 1. In a tap tool consisting of a metal holder 6 which can be freely attached and detached in the axial direction and restrained in free rotation in the rotational direction, a rear part is fitted into the metal holder 5 and locked. The inner surface of the tip of the tap body 9 is provided with female threads 10 of several pitches which are screwed into the screw 4a of several pitches of the base of the thread 4 of the tap body 1, and the screw 4a of the base of the screw of the tap body 1 is attached to the protective member 9. Since it is screwed into the female screw 10, there is an effect that the tap body 1 can be completely prevented from coming off during reverse rotation due to its structure.

[Brief description of drawings]

 The attached drawings show an embodiment of the present invention.

FIG. 1 is a vertical sectional side view of a first embodiment.

[Figure 2] Part 1 enlarged view

FIG. 3 is a perspective view of the protective member.

FIG. 4 is a vertical sectional side view of the second embodiment.

FIG. 5 is a vertical sectional side view showing a conventional tap tool.

[Explanation of symbols]

1 tap body, 2 shank, 3 concave groove, 4
Screw, 4a screw, pentagonal part, 6 metal holder, 7 shank insertion hole, 8 square hole, 9 protective member, 10 female screw, 11 helisert

Claims (1)

[Scope of utility model registration request] 1. A screw 4 for thread cutting prior to the shank 2.
Of the shank 2 and a square portion 5 provided at the rear of the shank 2, and a part of the shank 2 of the tap body 1 and the square portion 5 are freely detachable in the axial direction and freely rotatable in the rotation direction. In a tap tool consisting of a metal holder 6 for constraining and fitting a screw, the base of the screw 4 of the tap body 1 is formed on the inner surface of the tip of a protection member 9 whose rear part is fitted and locked in the metal holder 6. A tap tool in which a female screw 10 having a number of pitches to be screwed into a screw 4a having a number of is provided, and the screw 4a at the base of the screw of the tap body 1 is screwed into the female screw 10 of the protection member 9.